Asymmetric Aza-Mannich Addition of Oxazolones to <i>N</i>-Tosyl Aldimines: Synthesis of Chiral α-Disubstituted α,β-Diamino Acids
作者:Xiaodong Liu、Leijiao Deng、Xianxing Jiang、Wenjin Yan、Chunliang Liu、Rui Wang
DOI:10.1021/ol902916s
日期:2010.2.19
readily prepared cinchona alkaloid ligand and affords a series of valuable α-disubstituted α,β-diamino acid derivatives with excellent enantioselectivities (up to 97% ee) and diastereoselectivities (up to >30:1 dr). The adducts can be transformed into the corresponding protected chiral α-disubstituted α,β-diamino acids by a one-pot hydrolyzed reaction smoothly.
已经开发了恶唑酮向N-甲苯磺酰基亚胺的有机催化对映选择性加成。易于制备的金鸡纳生物碱配体促进了该过程,并提供了一系列有价值的α-二取代的α,β-二氨基酸衍生物,具有出色的对映选择性(高达97%ee)和非对映选择性(高达> 30:1 dr)。通过一锅水解反应,可以将加合物转化为相应的被保护的手性α-二取代的α,β-二氨基酸。